Agenda - Council - 01/24/2017 - Laserfiche WebLink

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3. EXISTING CONDITIONS 3.1 Existing Pavement and Soil Conditions The segment of Sunwood Drive between Ramsey Boulevard/CSAR 56 and Bunker Lake Boulevard/CR 116 was constructed in 1996 with 3.5 inches bituminous pavement, 5 inches class 5 aggregate base, B618 concrete curb and gutter, and concrete storm sewer. The street was constructed to a width of 40 feet from face-of-curb to face-of-curb, and is centered within an 80 foot wide right-of-way. Delineated parking lanes exist along both sides of the street. The existing posted speed is 35 mph along this entire segment of Sunwood Drive. The storm sewer system consists of numerous catch basins which drain runoff from the street to adjacent low- lying areas using concrete storm sewer pipes. In 2002 the pavement was cracksealed and sealcoated, and spot patching has been applied on an as-needed basis since. In 2016 Staff observed a Pavement and Surface Evaluation Rating (PASER) of 3 to 4, depending on location. In 2015, the City recorded a traffic volume of 3,500 average annual daily traffic (AADT). While truck counts are not available, Staff believes it is reasonable to assume between 5 and 10 percent of vehicles using this street segment can be classified as truck traffic, and that the percentage of trucks using this corridor could increase overtime due to current business expansion projects and since several undeveloped but developable parcels exist along the corridor. Northern Technologies, Inc. (NTI) was employed to complete a Geotechnical Exploration and Engineering Review for this project, including eleven (11) soil borings spaced approximately 200 feet apart along Sunwood Drive. The locations of the borings are shown in the Boring Location Diagram in Appendix C of NTI's report, attached in Appendix D. The soil borings provide information on existing bituminous pavement and aggregate base course thicknesses, subsurface soil conditions, existing ground water elevations, and potential issues that may be encountered during construction. All soil borings terminated at a nominal depth of 11 feet below the existing ground surface. Groundwater was observed in all soil borings at depths ranging between 7 and 9.5 feet below the existing ground surface. Based on the work proposed and the recorded water level depths, groundwater is not anticipated to be an issue for work completed with this proposed project. The soil borings generally indicate that existing bituminous pavement thicknesses range between 4.3 to 8.3 inches, with an average thickness of around 5 inches. Apparent aggregate base was not observed in any of the boring locations. Previously placed fill soils, generally consisting of poorly graded sand with silt(SP-SM), are present at depths ranging from 2.0 to 7.0 feet below the top of the pavement. Native alluvial soils consisting of poorly graded sand (SP), silty sand (SM), and poorly graded sand with silt(SP-SM) generally extend to the bottom of the borings. WSB and Associates (WSB)was employed to complete a total of four pavement corings. Their results showed an average bituminous pavement thickness of 4 inches, which was constructed over a class 5 aggregate base. Feasibility Report Sunwood Drive Reconstruction City of Ramsey Project No.I7-00 Page 4